Asbestos paper



May 6 1924, 1,493,371

W. J. MOELLER ASBESTOS PAPER Original Fil'ed March 5, 1922 1N VEN TOR Patented ay 6, F.9d.

WILLIAM SB. MUELLER, F CHICNATI, 0Q.

ASBESTOS PAPER.

Application filed March 8, 1922, Serial No. 540,891. Renewed uctomr 6, 1923.

To all whom it may concern:

Be it known that I, WILLIAM J. Monnnnn, a citizen. of the United States, and a resident of Cincinnati, in the county of Hamilton, State of Ohio (whose post-office address is -Wyoming, Ohio), have invented new and useful Improvements in Asbestos Paper, of which the following is a specification.

My invention relates to an improvement in, and process for, manufacture of asbestos paper. Heretofore in the manufacture of asbestos paper it has been found necessary in order to get the requisite strength to combine a substantial quantity of fibrous matter other than asbestos with the asbestos and as a result the product has been less satisfactory than it would have been had the paper been composed more nearly of all asbestos. It has also been found in use of asbestos paper that it would tend to break at the point .where a slight strain was ut on it and attempts, which were unsatis aotory, were made to overcome this by using a heavier paper than was desirable. This use of a heavy paper gave very little advantag by added strength, but that was more tha counteracted by using the heavy paper which had the disadvantage of increasing the weight of the finished product. Asbestos paper as heretofore made has had substantially no elasticity and could notbe stretched to any appreciable extent in any direction. I have sought to and have, overcome these objections by my improved asbestos paper and process of manufacture of same, and have obtained a paper which is capable of a great variety of uses. A aper which may be used in much lighter welghts, for: a 'ven purpose, than heretofore with increase eifi- 40 ciency in resultant products.

In the drawings Fig. 1 is a greatly onlarged sectional view of asbestos paper embodying my invention taken on line 11' ofFig. 2.

Fig. 2 is a plan view thereof of one surface. I

Fig. 3 is a plan view of. the other surface. In the carrying out of my process in the manufacture of my improved asbestos paper, I proceed in the ordinary way of making asbestos paper and either while the pulp sheet is being formed or later, but before being dried, I subject one surface of it to means for irregularly crping or' crinkling that surface, and the opposite surface to means for providing it with an innumerable number of adjoining small indentations, after which the sheet is dried without removing the indentations or the ridges or crping of the surfaces. As a result of this method some of the fibrous material or pulp forming the paper is piled, or laid, up in irregular ridges or elevations A of difi'erent or varying heights and depths. On one side of the ridges A the surface is comparatively smooth while on the opposite side it is rough and uneven and has a quantity of the fibres collected there. The finished product has one surface composed of an innumerable number of comparatively small indentations B, while the opposite surface is uneven or irregular and has lines or ridges A having the fibrous or stock material piled u to 'form same. The finished paper is of kewise varying thickness. This crping of the surface of the paper results in a rearran ement of the asbestos fibres, curling or 0 ding some while causing others to take ositions at various angles to the longitu inal length of the paper.

The preferred form of my improved asbestos paper having one surface rovided with a creped or crinkled efiect an the o 'posite surface formed of an innumerab 0 number of indentations is capable of being embossed without breakage because of the fact that. the crping or piling up of the pulp material and the consequent rearrangement of the fibres in the same either with or without the indentations of the opposite surface permits the stretching of the paper in any direction without breakage.

In the preferred form of my im roved paper the crep'ed surface has a mottle efiect caused by the portions of the surface on one side of a ridge being smooth and the portion on the other side of the ridge being rough Of course if desired both surfaces of my paper could be crped either in the same or opposite directions so that if the surface was rough at a given place the opposite surface at same point would be smooth, but I have found that a very satisfactory product is obtained by crping one side and roviding the opposite side with innumerab e small indentations.

In the preferred form of my invention shown in the drawings, or in the modifications referred to where both surfaces are 0 crped, a minute examination of a cross sec= tion would show a rearrangement of the fibres in the paper into a plurality of planes depending upon the pressure used in crping and indenting the surfaces.

Claims 1. A paper containing a major proportion of mineral fibres and having a crpedlike surface.

2. A paper containing a major proportion of mineral fibres and having one surface creped-like, the op osite surface being rovided with innumera le small adjoining indentations.

eeann 3. A paper containing a major pro ortion 1 of asbestos fibres with a suitable bin er, and having one surface thereof com osed of irregularly arranged elevations an depressionsn 4. A paper composed of asbestos fibre with suitable binder, and having a surface thereof composed of irregularly arranged elevations and depressions, the opposite surface having an innumerable number of small indentations.

In testimony whereof, I have signed my name to this specification.

WILLIAM J. MOELLER. 

